Datalogging thermometer recommendations.

• Datalogging thermometer recommendations.
  Posted by Vgkid on 23 Sep, 2015 21:22
• As the title suggest post your data logging thermometer reccomendations.
  What i need is one that uses an external temperature sensor. It will be subjected to temps from -20 to 100C.
  USB connectivity is preferred, and more than 1 chanel would be nice(2+ would be better).
  BUT it must be cheap.
  Not looking for real high accuracy.
• #1 Reply
  Posted by biot on 23 Sep, 2015 23:47
• Let me warn you about the UNI-T UT325: does everything you describe and inexpensive, BUT it only ever sends out data about one of its two channels -- big firmware screwup, since both are shown on  the display just  fine.
• #2 Reply
  Posted by radhaz on 24 Sep, 2015 00:04
• There's a number of China usb data loggng thermometers on ebay cheap.
• #3 Reply
  Posted by TSL on 24 Sep, 2015 06:24
• +1 radhaz
  
  I've used one of these to track a misbehaving lab aircon
  
  http://www.ebay.com/itm/BTHP02-2-Chs-Humidity-Temperature-Dew-Point-Data-Logger-USB-64K-32-000-readings-/281703381613
  
  Stick it on the wall for a month and collect and plot later.
• #4 Reply
  Posted by AndyC_772 on 24 Sep, 2015 07:01
• Amprobe TMD-56
  
  http://www.amprobe.com/Amprobe/usen/HVAC-Tools/Thermocouple-Thermometers/AMP-TMD-56.htm?PID=73414
  
• #5 Reply
  Posted by Rick Law on 24 Sep, 2015 19:25
• If you want to make one, an Arduino with the LM35z from TI.
  
  The TI LM35z is -55C to 150C with "typical accuracy" of 1/4C according to their datasheet.
  
  This Arduino+LM35z solution works rather well for me, but I have not exposed the Arduino part to -20C.  I use a meter-long wire and stick only the LM35z part into the outside environment.